Finely Tuned Fluorescence Emission of Polydiphenylacetylene Films Obtained by Copolymerization

Authors

  • Wang-Eun Lee,

    1. Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea
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  • Dong-Cheul Han,

    1. Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea
    2. Gumi Electronics and Information Technology Research Institute, Gumi, Gyeongsangbuk-do, 730-853, Korea
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  • Toshikazu Sakaguchi,

    Corresponding author
    1. Department of Materials Science and Engineering, Graduate School of Engineering, University of Fukui, Bunkyo, Fukui 910-8507, Japan
    • Department of Materials Science and Engineering, Graduate School of Engineering, University of Fukui, Bunkyo, Fukui 910-8507, Japan
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  • Yong-Bae Kim,

    1. Gumi Electronics and Information Technology Research Institute, Gumi, Gyeongsangbuk-do, 730-853, Korea
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  • Chang-Lyoul Lee,

    Corresponding author
    1. Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea
    • Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea.
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  • Giseop Kwak

    Corresponding author
    1. Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea
    • Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea
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Abstract

PDPAs containing longer (octadecyl, C18) and shorter (methyl, C1) alkyl side chains in the same backbone are synthesized. The copolymerization of C1 and C18 monomers at a range of feed ratios afford high-molecular-weight (Mw > 106) copolymers almost quantitatively. As the content of longer alkyl chain units in the copolymers increases, the emission band in the bulk film shifts to shorter wavelengths and the emission intensity increases. The lamellar layer distance increases with increasing C18 content. The excited species with shorter lifetimes decrease gradually with increasing C18 content, whereas the longer-lasting emission increases. Fine tuning of the FL emission of PDPAs is achieved by simple copolymerization of monomers with different alkyl side-chain lengths.

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